论文部分内容阅读
采用离子轰击去除不锈钢表面钝化膜并活化表面,然后在不同的渗碳温度条件下,用氢气和乙炔混合气体对AISI 316L奥氏体不锈钢进行硬化处理,研究了渗碳温度对不锈钢渗碳层组织和性能的影响。结果表明:AISI 316L奥氏体不锈钢低温离子-乙炔气体渗碳的临界温度为540℃。在440~540℃温度范围内,渗碳层中具有单一γc相结构,无铬的碳化物析出,硬化层厚度与硬度均随渗碳温度的升高而增加。当渗碳温度超过540℃,渗碳层中不仅含有γc相,而且会有新相生成(如Cr23C6、Cr7C3、Cr C、Fe3C、Fe2C),从而引起不锈钢耐蚀性能降低。
The passive film was removed by ion bombardment and the surface was activated. After that, AISI 316L austenitic stainless steel was hardened with mixed gas of hydrogen and acetylene at different carburizing temperature. The effect of carburizing temperature on the carburization of stainless steel The impact of organization and performance. The results show that the critical temperature for carburizing low temperature ion-acetylene gas of AISI 316L austenitic stainless steel is 540 ℃. In the temperature range of 440-540 ℃, there is a single γc phase structure in the carburized layer. The chromium-free carbides precipitate and the thickness and hardness of the hardened layer increase with increasing carburizing temperature. When carburizing temperature exceeds 540 ℃, the carburized layer not only contains γc phase, but also new phase (such as Cr23C6, Cr7C3, CrC, Fe3C and Fe2C), which will lead to the decrease of corrosion resistance of stainless steel.